Negative pressure device



FIG. 1 is a perspective view of a negative pressure device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a reference view that shows the negative pressure device in use.

The broken lines depict portions of a negative pressure device that form no part of the claim.

The dash-dot-dot broken line showing of a tube in FIG. 8 is for the purpose of illustrating environment and forms no part of the claimed design.

Shading is used to illustrate the curvature of the part and not color. 

CLAIM The ornamental design for a negative pressure device, as shown and described. 